1, http://www.drugstore.com/products/prod.asp?pid=241387&catid=12030
Burt's Bees Natural Fluoride-Free Multicare Toothpaste, Peppermint
4 oz (110 g) $3.99 一个

2, http://www.drugstore.com/products/prod.asp?pid=241399&catid=15479
Burt's Bees Natural Fluoride-Free Whitening Toothpaste, Peppermint
4 oz (110 g) $3.99 一个

3, http://www.drugstore.com/user/promo.asp?code=37C3D480&trx=29984&trxp1=101208&trxp2=4

这页是BOGO，要一个Tom's of Maine Clean & Gentle Care,SLS-free Anticavity + Whitening Tooth Paste, Peppermint 5.2 oz 和一个 Tom's of Maine Clean & Gentle Care, SLS-free Antiplaque + Whitening ToothPaste, Spearmint 5.2 oz 就是能看到的牙膏的第一个和第三个，折扣前各$5.29

4, http://www.drugstore.com/products/prod.asp?pid=150619&catid=15481&brand=9622&trx=PLST-0-BRAND&trxp1=15481&trxp2=150619&trxp3=1&trxp4=0&btrx=BUY-PLST-0-BRAND&cmbProdBrandFilter=9622
Tom's of Maine Natural Anticavity Fluoride Toothpaste, Spearmint Travel Size
1 oz (28 g)
要四个，buy 4 save $4.原价每个$1.99

一共是3.99×2 + 5.29×1 1/2 + (1.99*4-4) = $19.88